UTS 100K is the 106km ultra trail at Ultra-Trail Snowdonia by UTMB 2026 (Llanberis, United Kingdom). The race starts on May 15, 2026.
Hold a steady pace and save energy for every section.
By gradient, 37% of the distance is uphill, 43% downhill and 20% flat. The longest climb runs 11.2km at an average 9.2% grade (1026m of vertical). The longest descent runs 9.4km at an average 8.7% grade (819m of vertical). The steepest climb averages 40.6% over 0.3km. The steepest descent drops at 37.3% over 1.1km. Surface: 41% trail, 26% technical, 23% smooth, and 5% road. Flat-equivalent effort: 166.4 FlatKM.
The highest summit on the course is Snowdon (1085m), 72.5km from the start. Other named summits along the route: Carnedd Llewelyn (1064m) and Carnedd Dafydd (1044m).
Trekking poles are strongly recommended: about 16.6km of the course is steep enough for them to pay off.
Quad damage risk is high (index 62 of 100), with 48% of the load in the first half: 7 critical descents, the last of them run on already damaged legs. Downhill-specific preparation and a controlled early pace pay off here.
209 finishers completed the 2026 edition. Men's winner: Paul Cornut Chauvinc (France) in 11:51:43. Women's winner: Ariane Wilhem (Switzerland) in 16:02:48.
This page has the full results and splits, a pacing and nutrition planner, a gradient matrix, an interactive elevation profile and historical weather for UTS 100K.
Other distances of Ultra-Trail Snowdonia by UTMB 2026UTS 100M (164km)·UTS 80K (78.0km)·UTS 50K (56.0km)·ERYRI 25K (25.0km)
Other editions of UTS 100K2025
Official websitesnowdonia.utmb.world